Yes, he means the main thermostat.
I agree, I misread that ASH hoses discount code everytime I see it
You'll find lots of willing assistance if you do want to tackle jobs "yourself"*, but don't feel that you have to! There are plenty of small specialists dotted all around the country these days, for those jobs that you don't want to undertake. More importantly, there's no stigma attached to using them either. Times have changed now, many of us have far less time for doing jobs on the cars than we used to, and when you just want to go for a drive, there's nothing worse than having a list of car chores that must be completed first.
*Note, this assistance can range from you carrying out the job with someone casting an experienced eye over your shoulder and offering hints and tips, to at the other end of the scale, you seeing your car hidden under a group of local members, while you permanently bring in cups of tea and bacon butties! It's whatever works for you...